[rzk]

i'd say that raising now is pretty close to calling and raising the turn.

i think an important variable to consider in making this decision is your estimate of how likely he will be to fold A high and good K high in both lines.

if you think the probabilities are roughly the same i say raise now - the semibluff will be cheaper and implied odds are greater. if they are very different then maybe it's better to raise the turn.

based on the info you gave in the OP i'd go with raising now.

EDIT: i also think that a weak K high is a bit too weak to use the call call call line.